Browsing by Subject "Extraction (Chemistry)"
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Item Analysis of biomass gasification products(Texas Tech University, 1981-05) Ruggieri, Russell JNot availableItem Ethanol dehydration using potassium acetate salt effect, extractive distillation(Texas Tech University, 1984-08) Fan, Frank IuelienThis thesis describes the physical chemistry of recovering absolute ethanol using extractive distillation. The process being evaluated uses dissolved salt, potassium acetate, as the separating agent. The research includes the first successful use of a thermodynamic consistency test for the ethanol-water-potassium acetate (E-W-KOAc) system. This work shows that the Meranda and Furter [1966] data are thermodynamically consistent, while the Costa Novella [1952] data are not. The solvation method is used to predict vapor-liquid equilibrium (VLE) data for the saturated or unsaturated E-W-KOAc ternary system for the first time. The VLE prediction is used in a computer simulation of salt effect, extractive distillation. In order to simulate extractive distillation, measurements of the solubility of potassium acetate in the ethanol-water system at 6 temperatures, 79, 74, 72.5, 65, 61, 59°C and 1 atm were made.Item Extraction of organic chemicals from mesquite(Texas Tech University, 1981-12) Chen, Shou-jen RNot availableItem Extraction of waste water from biomass gasification(Texas Tech University, 1980-08) Kao, Chih-hengA waste water mixture from the pyrolysis of cattle manure, wood residues and corn stover was examined. Some methods of waste water treatment were screened. Activated carbon adsorption and solvent (carbontetrachloride, methylene chloride, n-butyl alcohol and methyl ethyl ketone) extraction were the methods chosen to treat the waste water. The results showed that dual solvent extraction using methyl ethyl ketone as a polar solvent to extract the valuable pollutants from the waste water and nhexane as a volatile solvent to recover the dissolved, polar solvent from the extracted water is an effective method to treat the waste water. A computer program has been developed to aid in the design of a solvent extraction column.Item Formation of complexes of potassium and sodium cations with dicyclohexano-18-crown-6, dibenzo-18-crown-6 and cyclohexano-15-crown-5 over a temperature range of 2° to 38°C(Texas Tech University, 1980-08) Mehta, Bharatkumar G.The percent extraction of potassium and sodium ions from aqueous solution has been measured for DC18C6, DB18C6 and C15C5 dissolved in methylene chloride as a function of temperature. The percent extraction was found to decrease as the temperature increased. For the binary mixture of potassium and sodium ions, synergestic effects appeared. These synergestic effects become pronounced as the temperature increases Also distribution coefficients were measured and observed to follow the same behavior with temperature. Selectivity for DC18C6 and DB18C6 is higher at room temperature (25°-30°C) for potassium over sodium ions Initial concentrations were kept constant during the whole course of experiment, only the effects of ions, ring size, and ring structure were investigated.Item Group-Contribution Methods in Estimating Liquid-Liquid Distribution Coefficients(Texas Tech University, 1981-05) Liu, Che KeungNot Available.Item Synthesis of new separating agents for nuclear materials(Texas Tech University, 1998-08) Nam, JaewookSynthetic methods for the preparation of complexing agents for the separation of radionuclide materials are described in this dissertation. Several series of new bifunctional anion-exchange resins were prepared by reaction of Reillex™ 402 po]y(4-vinylpyridine) resin with alkylating agents CL>-Br(CH2)nQ^ in Q"^ = trimethylammonio. trimethylphosphonio, and pyridinium groups. By variation of the number of methylene groups in the spacer, the distance between the two anion-exchange sites was systematically varied. The structural variations in these bifunctional anion-exchange resins were made to investigate their Pu(IV) sorption behavior from nitric acid media. Partial substitution of linear poly(vinylpyridine)with hydrophilic groups provided new water-soluble polymers which have potential for use in metal separation using ultrafiltration membranes. For the cesium extraction from acidic nitratemedia, several series of macrocyclic polyether compounds which have oxygenated, aliphatic side arms were prepared. Acylation of dibenzo-18-crown-6 (or dibenzo-21-crown-7) and subsequent reduction provided new carbon atom-linked side armed cyclic polyether extractants. Several approaches to the synthesis of oxygen atom-linked side armed cyclic polyether extractants were explored with the model compound Sesamol. Although results of the model studies were promising, all attempts to extend the methods to the preparation of oxygen atom-linked side armed crown ethers were unsuccessful.